Traceback (most recent call last):
  File "/usr/lib/telepathy/telepathy-butterfly", line 33, in <module>
    from butterfly import ButterflyConnectionManager
  File "/usr/lib/python2.6/dist-packages/butterfly/__init__.py", line 19, in <module>
    from connection_manager import *
  File "/usr/lib/python2.6/dist-packages/butterfly/connection_manager.py", line 24, in <module>
    from butterfly.connection import ButterflyConnection
  File "/usr/lib/python2.6/dist-packages/butterfly/connection.py", line 24, in <module>
    import pymsn
ImportError: No module named pymsn